Engineering, 17.04.2020 18:04 Jordan0423
Groundwater with a noncarbonated hardness (NCH) of 75 mg/L as CaCO3 is treated by a lime-soda process. The targeted hardness is 60 mg/L as CaCO Addressing only the NCH. How much Soda is required?
a. 135 mg/L as CaCO3
b. 55 mg/L as CaCO3
c. No Soda is required
d. 15 mg/L as CaCO3
Answers: 3
Engineering, 03.07.2019 14:10
Amass of 1.5 kg of air at 120 kpa and 24Ā°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
Answers: 2
Engineering, 03.07.2019 15:10
Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?
Answers: 3
Engineering, 04.07.2019 18:10
Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux
Answers: 3
Engineering, 04.07.2019 19:10
The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object
Answers: 1
Groundwater with a noncarbonated hardness (NCH) of 75 mg/L as CaCO3 is treated by a lime-soda proces...
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